P.R. Laws Ap. tit. 34A, § II, Rule 236
2019-02-21 00:00:00+00
A subpoena may be served by any person, but a peace officer must serve in his district any subpoena delivered to him for service, either on the part of The People or the defendant. Service of a subpoena is made by showing the original to the witness personally and delivering a copy thereof to him or sending it by mail to his last address, with return receipt. The person serving a subpoena must make a written return of the service, stating the time and place of service. In case where service is made by mail he must also include the return receipt.